RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Two-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters

TitleTwo-Photon Interference from the Far-Field Emission of Chip-Integrated Cavity-Coupled Emitters
Publication TypeJournal Article
Year of Publication2016
AuthorsJ-H. Kim, C. J. K. Richardson, R. P. Leavitt, and E. Waks
Date PublishedNOV

Interactions between solid-state quantum emitters and cavities are important for a broad range of applications in quantum communication, linear optical quantum computing, nonlinear photonics, and photonic quantum simulation. These applications often require combining many devices on a single chip with identical emission wavelengths in order to generate two-photon interference, the primary mechanism for achieving effective photon photon interactions. Such integration remains extremely challenging due to inhomogeneous broadening and fabrication errors that randomize the resonant frequencies of both the emitters and cavities. In this Letter, we demonstrate two-photon interference from independent cavity-coupled emitters on the same chip, providing a potential solution to this long-standing problem. We overcome spectral mismatch between different cavities due to fabrication errors by depositing and locally evaporating a thin layer of condensed nitrogen. We integrate optical heaters to tune individual dots within each cavity to the same resonance with better than 3 mu eV of precision. Combining these tuning methods, we demonstrate two-photon interference between two devices spaced by less than 15 mu m on the same chip with a postselected visibility of 33%, which is limited by timing resolution of the detectors and background. These results pave the way to integrate multiple quantum light sources on the same chip to develop quantum photonic devices.


Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to